The ABB CMA121 (3DDE300401) is a 20W industrial DC/DC converter designed for DCS applications. It provides a stable 5V output from a 24V nominal source with 500V galvanic isolation. This Sweden-made 4A module ensures high efficiency and superior noise protection for sensitive control electronics.
The ABB CMA121 serves as a high-precision DC/DC converter for sophisticated industrial automation systems. This module primarily transforms fluctuating 24V nominal input into a stable 5V output for logic circuits. It effectively powers sensitive processors and communication components within a Distributed Control System. By maintaining a tight voltage tolerance, the unit prevents logic errors in critical controllers. Engineers integrate this hardware to ensure consistent performance across diverse electrical environments.
The 3DDE300401 module delivers up to 20W of regulated power with an impressive 85% efficiency rating. It features 500V DC galvanic isolation between the input and output stages. This barrier protects internal electronics from ground loops and external electrical noise. Furthermore, the module filters ripple and noise to less than 50mV peak-to-peak. These advanced electrical properties guarantee clean power delivery even in high-interference manufacturing zones.
The Swedish-manufactured CMA121 features a slim 2.8cm profile for space-efficient cabinet mounting. Its rugged construction withstands the vibrations and thermal stress of motor control centers. The module accepts a wide input range from 18V to 32V DC. Consequently, the power supply remains operational during significant voltage drops in the primary line. This durability makes the unit an essential component for long-term reliability in process industries.
| Specification | Technical Detail |
| Brand | ABB |
| Model | CMA121 |
| Order Code | 3DDE300401 |
| Input Voltage Range | 18 – 32V DC |
| Output Voltage | 5V DC (±1%) |
| Maximum Output Current | 4.0 A |
| Total Power Output | 20 W |
| Electrical Isolation | 500V DC |
| Net Weight | 0.54 kg |
| Physical Dimensions | 2.8 x 18.5 x 12.8 cm |
| Status | Active Lifecycle |
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